Abstract
A new near-field optical storage system utilizing a left-handed material (LHM) is introduced by attaching an LHM slab to the lower surface of a conventional solid immersion lens (SIL). The performance of the present storage system is compared with a conventional SIL system through numerical simulation. The LHM slab in the present storage system can image very well the focused spot at the lower surface of the SIL to the surface of a disc. It allows a large air-gap for the mechanical convenience while keeping a large signal contrast and a high storage density. The tolerance of the air-gap is also improved.
Highlights
To increase the storage density, solid immersion lenses (SILs) have been used in optical storage systems by means of increasing the numerical aperture [1]
The performance of the present storage system is compared with a conventional SIL system through numerical simulation
The left-handed material (LHM) slab in the present storage system can image very well the focused spot at the lower surface of the SIL to the surface of a disc. It allows a large air-gap for the mechanical convenience while keeping a large signal contrast and a high storage density
Summary
To increase the storage density, solid immersion lenses (SILs) have been used in optical storage systems by means of increasing the numerical aperture [1]. In order to achieve a large signal contrast and a high storage density, the disc should always be placed very close to the lower surface of the SIL (usually the air-gap ha is smaller than 100nm). This will bring some mechanical difficulty/inconvenience of the storage system. We introduce a new near-field optical storage system by attaching an LHM slab to the lower surface of the SIL (hereafter we refer to this system as an L-SIL system; see the right inset of Fig. 1)
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